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Effect of polymer morphology on P3HT-based solid-state dye sensitized solar cells: an ultrafast spectroscopic investigation

R. Sai Santosh Kumar, G. Grancini, A. Petrozza, A. Abrusci, H. J. Snaith, and G. Lanzani

Open Access Open Access

Abstract

Solid-state dye sensitized solar cell devices are fabricated with poly(3-hexylthiophene) (P3HT) as the hole transporting layer. Upon annealing treatment we obtained ≈70% increase in the device efficiency compared to un-annealed devices. Our investigation, by means of ultrafast transient absorption spectroscopic characterization, correlates the increased device performances to a more efficient hole-transfer at the dye/polymer interface in the thermally treated P3HT.

©2013 Optical Society of America

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Figures (4)
Fig. 1
Fig. 1 Normalized absorption spectra and molecular structure of D131, P3HT and the complete photovoltaic composite deposited on 1 μm TiO2. The shaded region represents the excitation pulse used for fs-TAS.

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Fig. 2
Fig. 2 (a) Schematic design of the fabricated sDSC; (b) J-V characteristic for RRa P3HT (green empty dots), RRe P3HT (black full squares), thermal annealed RRe P3HT (red dotted line) and corresponding dark current in solid line. In the inset the table showing the device parameters

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Fig. 3
Fig. 3 ΔT/T spectra of TiO2/D131/P3HT (a) un-annealed and (b) annealed devices by exciting the dye molecules at 390nm and probe in both the VIS spectral region.

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Fig. 4
Fig. 4 Comparison of ΔT/T dynamics at: (a) 610nm, (b) 730nm for un-annealed (black -□-) and annealed (red –o-) devices.

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